Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1871666374c97d7…

MALICIOUS

PDF

80.7 KB Created: 2021-05-15 06:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 09ca02afd6dd7a3f76be41feeb7cd6ae SHA-1: 5058237acf92579a3a64590f7abeaf5c7d3f2354 SHA-256: b1871666374c97d7f274b37cc4dbfb72598ee1befc766630f624cc159670415e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing indicating it is a phishing lure that redirects to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://baarspo.ru/strik?utm_term=how+many+sweet+potatoes+make+a+lb` is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=how+many+sweet+potatoes+make+a+lb PDF link annotation
    • https://cdn.sqhk.co/joraxeneli/A7hjgcZ/bugs_bunny_converse.pdfIn PDF document text
    • http://bujaxodu.iblogger.org/sintese_da_acetilcolina.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/jd4Ouhe/war_of_independence_usa_battles.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/jfhajdQ/rebovezeberipomajafofodi.pdfIn PDF document text
    • http://razokibogoze.iblogger.org/lupoxudov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_6013197409952.pdfIn PDF document text
    • http://nixiziloge.iblogger.org/40629236295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_6061f5406756f.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/iek0jcQ/58943837313.pdfIn PDF document text
    • http://ruperamumafuvaz.22web.org/affidavit_of_arrest_sample_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/figo_guidelines_for_placenta_accreta.pdfIn PDF document text
    • http://vewizoxevig.rf.gd/how_to_start_an_ariens_deluxe_28.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/fibasika.pdfIn PDF document text
    • http://dafolilujoxupan.rf.gd/bearing_types_and_application.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vemirofijafomozugijijon.pdfIn PDF document text
    • http://delifas.epizy.com/can_1_person_build_a_house.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/light_and_healthy_indian_vegetarian_dinner_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/browning_dark_ops_trail_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/appointments_julien_baker_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/android_studio_sqlite_primary_key_autoincrement.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 4968 bytes
SHA-256: 6d352454322727e694752c02a5a18794f8b46a9bc5e8799de50f24c5f7d400d8
font_01_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 10888 bytes
SHA-256: 76a31345fa08ea0e23c7c2176160e4e34fa9e38fb7bc1e9ee7d0bc197a1e180d
font_02_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c